Planning and Checkpoints

- When work spans multiple steps or has ambiguity, write a brief plan.
- Steps are 1 sentence, action‑oriented, and verifiable.
- Keep exactly one `in_progress` step; mark completed before moving on.
- Update the plan when reality changes; add rationale for plan changes.
- Don’t pad trivial tasks with plans.

Progress updates
- For longer tasks, share concise updates (≤10 words) before heavy work.
- State what’s done, what’s next, and any blockers.